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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Engine Controls And Fuel - 2.0L - DTC P0243 To DTC P0690) >> DTC P0638, P1551, P2100, P2101, or P2119 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the throttle body for the following conditions:
    • A throttle blade that is not in the rest position
    • A throttle valve that is binding open or closed
    • A throttle valve that opens or closes without spring pressure
    • If a condition is found, replace the throttle body.
    2. NOTE: Disconnecting the throttle body harness connector causes additional DTCs to set.
  2. Ignition OFF, disconnect the harness connector of the throttle body.
  3. Ignition ON, test for 4.0-4.2 V between the TAC motor control 1 circuit terminal B and ground.
    • If voltage is greater than the specified range, test each of the motor control circuits for a short to voltage. If the circuits tests normal, replace the Engine Control Module.
    • If voltage is less than the specified range, test the motor control 1 circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the Engine Control Module.
  4. Connect a test lamp between the TAC motor control 2 circuit terminal A and B+. The test lamp should NOT illuminate.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the Engine Control Module.
  5. Test for greater than 3.5 V between TAC motor control 1 circuit terminal B and TAC motor control 2 circuit terminal A.
    • If the voltage is less than the specified value, test the motor control 2 circuit for an open/high resistance. If the circuit tests normal, replace the Engine Control Module.
  6. Ignition OFF, connect the EL 34730-405:  Injector Test Lamp between the TAC motor control 1 circuit terminal B and TAC motor control 2 circuit terminal A of the throttle body harness connector. Observe the injector test lamp while turning the ignition ON for 5 s and then OFF. Verify the injector test lamp illuminates brightly and then turns OFF.
    • If the injector test lamp does not illuminate, replace the Engine Control Module.
  7. If all circuits test normal, replace the throttle body.
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